NASA reports that the seemingly-unstoppable robotic geologist Opportunity is finding things at Endeavour crater that it has never seen before, adding new life to a mission that has already been epic. Observations "suggest that rock exposures on Endeavour's rim date from early in Martian history and include clay minerals that form in less-acidic wet conditions, possibly more favorable for life." In a teleconference today, one mission scientist compared this new phase of exploration to a "whole new mission." More information, including lots of pictures, here."